Added scope structures.

Not yet used in exec.c.

src/include/scope.h

@@ -0,0 +1,19 @@
+#ifndef SCOPE_H
+#define SCOPE_H
+
+#include "htab.h"
+
+// Represents the reverse linked tree of scope.
+typedef struct SCOPE_T {
+    HTab* here;
+    struct SCOPE_T* inherit;
+} Scope;
+
+// Create a new `Scope`.
+Scope* scope_init(HTab* here, Scope* inherit);
+// Destroy all linked `Scope`s this inherits from.
+void scope_destroy(Scope* scope);
+// Destroy the current `Scope` only.
+void scope_destroy_psv(Scope *scope);
+
+#endif

src/scope.c

@@ -0,0 +1,24 @@
+#include "include/scope.h"
+#include "include/htab.h"
+#include <stdlib.h>
+
+Scope* scope_init(HTab* here, Scope* inherit) {
+    Scope* scope = malloc(sizeof(Scope));
+
+    scope->here = here;
+    scope->inherit = inherit;
+
+    return scope;
+}
+
+void scope_destroy(Scope* scope) {
+    htab_destroy(scope->here);
+    if (scope->inherit != NULL) scope_destroy(scope->inherit);
+    free(scope);
+}
+
+void scope_destroy_psv(Scope* scope) {
+    htab_destroy(scope->here);
+    scope->inherit = NULL;
+    free(scope);
+}